Anime: Inuyasha

This is more of a teen-age girl fantasy/romance, but it does take place during the Sengoku era.

It's one of the most popular animes from Japan.  It lasted for almost 200 episodes, and the manga, I think, went on for about 12 years.

Although the series had been going on for years, and ended a couple of years ago, I recently found a dvd of the first 54 episodes and I got hooked.

Basically, the plot is about a 15 year old girl who time travels back to the Sengoku era.  Apparently, she is the reincarnation of a priestess, who fights demon, but was killed. She resurrects a half-demon young man who wants to be a full-fledged demon.  But in the ensuing battle, she shatters a gem that has magical powers.  The entire series is about collecting all the fragments of the gem - for use - good or evil, depending on who gets hold of the whole gem.

As I write this, I realize it is pretty in-depth. Here is the wiki to the story: Inuyasha